In the global push for cleaner energy, one Finnish oil company fuels its growth by making diesel from animal fat

One of the best-performing stocks in the global oil sector this year is a company that makes most of its money without touching crude.

Finnish state-backed refiner Neste has carved out a niche using proprietary processing to turn animal fat and plant oil into renewable diesel. The product has virtually the same chemical properties as diesel made from fossil fuels, but produces a fraction of the carbon emissions.

Neste...

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